Defeat 20 enemies in one game.

Defeat 1,000,000 enemies in multiple games.

Defeat 50 enemies in a row with no misses.

Defeat 100 enemies in a row with no misses.

Defeat 200 enemies in a row with no misses.

Shoot the passing alien ship.

Shoot the passing alien ship 5 times in one game.

Shoot the passing alien ship 20 times in one game.

Shoot the passing alien ship 100 times in multiple games.

Survive until the end of the universe.

Survive until the end of the universe five times.

Defeat 108 enemies in one game.

Defeat one Purple Freak.

Defeat 50 Purple Freaks in multiple games.

Defeat The Big Purple Freak.

Fire 10,000 shots.

Fire 100,000 shots.

Play 10 games.

Play 50 games.

Play 200 games.

Tweet your score.

Tweet your score 10 times.

Defeat 300 enemies in one game.

Facebook-post your score.

Defeat 500 enemies in one game.

Defeat 1,000 enemies in one game.

Defeat a Big Freak.

Defeat 1,000 enemies in multiple games.

Defeat 5,000 enemies in multiple games.

Defeat 10,000 enemies in multiple games.